I commute to college so my experience so far has been kind of stuffty. I really want to get into doing more stuff on campus this year. Whatever you do don't be a little friend and not go to any parties or anything. I didn't and I really regret it. I'm not saying go out and get stufffaced all the time but really you need to go out and do stuff. Don't just spend every waking hour studying.
Freshman year isn't as hard as everyone makes it out to be. If you actually show up and pay attention you'll be fine. Skipping classes is really what will make you do bad. If you pay attention and show up you won't have to spend hours studying. I ended up studying only for tests and I did pretty well my first semester. I started not showing up last semester and did awful, I ended up having to take a summer chem class to fix my gpa.
In short, have fun and make sure you actually show up to classes. Also don't buy books before the end of the first week. You might not need some of them and books are super expensive.